Water quality monitor for a water purification system
US5580444A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1994 |
| Grant date | Dec 3, 1996 |
| Priority date | — |
| Expiry date | Mar 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D21/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved water quality monitor is provided for use in a water purification system of the type having a reverse osmosis unit for producing relatively pure water from a tap water supply. The reverse osmosis unit supplies produced purified water to a reservoir for storage until dispensing, as by opening a faucet valve. An inlet shut-off valve closes to prevent tap water inflow to the reverse osmosis unit when the reservoir reaches a substantially filled condition. The water quality monitor includes electrodes in contact with the tap water and the produced purified water to obtain comparative conductivity readings which represent the performance level of the reverse osmosis unit in removing impurities from the tap water inflow. The monitor includes a test circuit responsive to movement of the inlet shut-off valve to take a conductivity reading at a point in time substantially after the shut-off valve opens to resume tap water inflow to the reverse osmosis unit, and substantially prior to shut-off valve closure when the reservoir reaches the filled condition. This conductivity reading is stored in memory for subsequent periodic display, for example, each time the faucet valve is open…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.